International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2572

Table of Content: 18 May; 6(10)

May 2011

An FPGA realization of simplified turbo decoder architecture

The key issue of applying Turbo codes is to find an efficient implementation of turbo decoder. This paper addresses the implementation of a simplified and efficient turbo decoder in field programmable gate array (FPGA) technology. A simplified and efficient implementation of a Turbo decoder with minor performance loss has been proposed. An integer Turbo decoder based on the standard 2’s complement number system...

Author(s): Shivani Verma and Kumar S.

May 2011

A novel cost-based framework for communication in computational grid using Anycast Routing

Computational grid can perform the computationally extensive jobs by utilizing the wide spread processing capabilities of volunteer processors. In order to utilize the wide spread resources, failure options cannot be ignored. In this paper we give the detailed implementation of fault tolerance techniques, and also propose a modified forwarding mechanism which forwards the request to the next hop from which more...

Author(s): Abid Ali Minhas, Fazl-e-Hadi and Shakir Ullah Shah

May 2011

Caching data approach in randomized re-routing algorithm (CRRR) in wireless sensor networks

In wireless environments, congestion and link error can cause packets to be lost. Thesetwo factors are reducing the end-to-end reliability and energy efficiency. These problems can be overcome by recovering lost packets using retransmission. Since the delay is...

Author(s): Majid Haghparast, Vida Aghakhanloyetakanloo and Maryam Kordlar

May 2011

Multi objective control of UPFC using PID type controllers

This paper presents the application of Unified Power Flow Controller (UPFC) in order to simultaneously power flow control, voltage support and also transient stability improvement at a Single-Machine Infinite-Bus (SMIB) power system installed with UPFC. In practical systems, the conventional PI type controllers are considered to control UPFC. In order to overcome the drawbacks of the conventional PI controllers,...

Author(s): Meysam Eghtedari, Reza Hemmati and Sayed Mojtaba Shirvani Boroujeni

May 2011

Statistical optimization for process parameters to reduce variability of 32 nm PMOS transistor threshold voltage

This paper explains our investigation of the effect on 32 nm PMOS device threshold voltage (VTH) by four process parameters, namely HALO implantation, Source/Drain (S/D) implantation dose, compensation implantations, and silicide annealing time. Taguchi method determines the setting of process parameters in experimental design while analysis of variance (ANOVA) determines the influence of the main process parameters on...

Author(s): H. A. Elgomati, B. Y. Majlis, I. Ahmad, F. Salehuddin, F. A. Hamid, A. Zaharim, T. Z. Mohamad and P. R. Apte

May 2011

Monitoring of tool wear and surface roughness in end-milling for intelligent machining

Recently, cutting tool and product quality management in intelligent machining has been implemented by automated tool and quality monitoring and control systems. These systems utilize born features recognized in indirect signals, which reflect, on-line, the tool and quality conditions. In this research work, study was carried out to analyze the dynamic cutting signals of the end-milling process, in order to establish a...

Author(s): Ahmed A. D. Sarhan and R. M. El-Zahry

May 2011

A novel theoretical analysis of quadruple pass Erbium-doped fiber amplifier

A novel theoretical analysis model of dual stage quadruple pass (DSQP) Erbium-doped Fiber Amplifier (EDFA) is presented in this paper. This analysis is carried out by the broad input signal power starting from -50 to 0 dBm input signal with 10 to 220 mW pumping powers. The EDFA has been proposed and demonstrated by using an optical circulator and tunable band pass to reflect signal in each stage with a two level pump...

Author(s): A. W. Naji, M. A. Mohammed, B. B. Zaidan, A. A. Zaidan, Wajdi ALKhateeb, K. A. S. Al-Khateeb and M. A. Mahdi

May 2011

An improved genetic algorithm for solving simulation optimization problems

Simulation optimization studies the problem of optimizing simulation-based objectives. Simulation optimization is a new and hot topic in the field of system simulation and operational research. To improve the search efficiency, this paper presents a hybrid approach which combined genetic algorithm and local optimization technique for simulation optimization problems. Through the combination of genetic algorithms and...

Author(s): Hao Xu,  Pu Wan and Lan Huang

May 2011

An application of grout curtains to the Dalaman -Akköprü Dam

Grouting is one of the most popular methods used to control water leakage in fill dam constructions. Geological and geotechnical properties of the rock/soil to be grouted are important parameters influencing the design of the grouting. In this study, geotechnical properties of Dalaman-Akköprü Dam’s base rock and the grouting procedure have been investigated in view of their suitability to grouting. In...

Author(s): Devrim ALKAYA, Ä°brahim ÇOBANOÄžLU and Burak YEŞİL

May 2011

An investigation of the flexural behaviour of reinforced lightweight concrete beams

This paper presents an investigation of the flexural behaviour of reinforced lightweight concrete beams made from lightweight expanded clay aggregate (LECA). Nine reinforced concrete beams were fabricated and tested using the symmetrical two-point loads test. The concrete strength and steel bar reinforcement were two important parameters examined during the beam tests. The paper compares flexural performance of the...

Author(s): Payam Shafigh, Mahmoud Hassanpour M., S. Vahid Razavi and Mohsen Kobraei

May 2011

Fractal behavior of the sales restaurant in a great tourism hotel

The tourist industry can be considered as a complex system because it is made up of many elements (tourist companies) that interact with each other in a non-linear way. In turn, each company can also be considered by itself as a complex system because its behavior is non-linear with time, so that some aspects of tourism companies can be characterized by a non-linear mathematical tool called fractal analysis. In this...

Author(s): Abraham Briones-Juarez, Ricardo Tejeida Padilla, Oswaldo Morales-Matamoros and Isaías Badillo-Piña

May 2011

Correlation between total water absorption and wet compressive strength of compressed stabilised peat bricks

Housing is a great problem in today and future world, the most basic building material for infrastructure construction and houses is the usual bricks or blocks. Although there are approximately 2,500 000 hectares of peat soils in Malaysia, only a small portion of this as being utilised. In this study, peat soil was investigated in tandem with the production of lightweight bricks. Peat soil, sand, cement and hydrated...

Author(s): Sadek  Deboucha and Roslan Hashim

May 2011

General regression neural network (GRNN) for the first crack analysis prediction of strengthened RC one-way slab by CFRP

In this study, six strengthened RC one-way slabs with different lengths and thicknesses of CFRP were tested and compared with a similar RC slab without CFRP. The dimensions of the slabs were1800 x 400 x 120 mm and the lengths of CFRP used were 700, 1100, and 1500 mm, with different thicknesses of 1.2 and 1.8 mm. The results of the experimental operation for the first crack were used to generate general regression neural...

Author(s): Razavi S. V., Jumaat M. Z., Ahmed H. EI-Shafie and Pegah Mohammadi

May 2011

ZnO as corrosion inhibitor for dissolution of zinc electrodeposited mild steel in varying HCl concentration

The corrosion behavior of Zn electrodeposition on mild steel in varying 0.1 to 0.5 M of HCl with and without inhibitor was studied using weight loss measurement and optical microscope. The (OP) results revealed that the corrosion mechanism layers of the zinc plated mild steel without inhibitor has high content corrosivity related to the appearance of cracks due to the dissolution into the acidic medium. However, the...

Author(s): A. P. I. Popoola and O. S. I. Fayomi

May 2011

Effects of the fine recycled concrete aggregates on the concrete properties

In this experimental study, the effects of the recycled fine recycled concrete aggregate (FRA) that was manufactured from concrete wastes on the concrete properties were investigated. In concrete mixtures, 0, 10, 20, 30, 40, 50 and 100% by weight FRA were used instead of river sand. Afterwards, unit weight and water absorption ratios and 28-day compressive strength were determined. According to the test results...

Author(s): Hasbi Yaprak, Huseyin Yılmaz Aruntas, Ilhami Demir, Osman Simsek and Gokhan Durmus

May 2011

Fractal characterization of an after-sales spare parts supply chain in Telecom industry

Data series generated by complex systems exhibit fluctuations on a wide range of time scales, which often follow a scaling relation over several orders of magnitude. Such scaling laws allow for a characterization of the data and the generating complex system by fractal scaling exponents, which can serve as characteristic fingerprints of the systems in comparisons with other systems and models. In this article was...

Author(s): Morales-Matamoros Oswaldo, Flores-Cadena Mauricio, Tejeida-Padilla Ricardo, Badillo-Piña Isaías and Carvajal-Mariscal Ignacio

May 2011

Application of importance-satisfaction model to identify critical success factors of hot-spring industry in Taiwan

There are many variety methods used in determining the critical success factors (CSFs) of the hot-spring industry in Taiwan, such as action research, case study, literature review and structured interviewing. In contrast, there are relatively few studies on the many models used to identify CSFs. To address this relative deficiency in the literature, the present study integrates importance satisfaction model...

Author(s): Shun-Hsing Chen and Chen-I Huang

May 2011

Anti-synchronization of uncertain Rikitake systems via active sliding mode control

In this paper, an active sliding mode controller is presented for a class of master-slave anti-synchronization of uncertain Rikitake systems. Uncertainties are considered in linear and nonlinear parts of the Rikitake systems. Analysis of the stability for the proposed method is derived based on the Lyapunov stability theory. Numerical simulations are performed to evaluate effectiveness of the analytical...

Author(s): Xiao Jian

May 2011

On approximate solutions for the time-fractional reaction-diffusion equation of Fisher type

In this paper, the homotopy perturbation method (HPM) is employed to obtain approximate analytical solutions of the time-fractional reaction-diffusion equation of the Fisher type. The method can easily be applied to many problems and is capable of reducing the size of computational work. The fractional derivative is described in the Caputo sense. The analytical/numerical results are compared with existing analytic...

Author(s): Najeeb Alam Khan, Muhammad Ayaz, Lin Jin and Ahmet Yildirim

May 2011

Analysis of non-Newtonian blood flow through stenosed vessel in porous medium under the effect of magnetic field

The present study is analysis of non-Newtonian blood flow through stenosed vessel in porous medium. The blood is assumed to be pulsatile couple stress fluid. The effect of externally applied magnetic field on blood flow in porous medium is studied in the present analysis. The expressions of axial velocity, flow rate and shear stress have been obtained by using Laplace and finite Hankel transforms and their graphical...

Author(s): Jagdish Singh and Rajbala Rathee

May 2011

Synthesis, spectral studies of 4-{[(3-substitutedphenyl)imino]methyl}-3-hydroxyphenyl octadecanoate and effect of meta substituents on mesomorphic properties

A series of Schiff base esters was synthesized from the reaction between 4-formyl-3-hydroxyphenyl octadecanoate and 3-substituted-anilines. The molecular structures were elucidated using spectroscopic techniques such as FT-IR and NMR. A conformational study associated with the presence of intramolecular hydrogen bonding which entails the formation of the keto-enol tautomerism in the solid and solution states are...

Author(s): Sie-Tiong Ha, Yip-Foo Win, Siew-Ling Lee, Masato M. Ito, Kazuma Abe, Hidetoshi Oonishi and Guan-Yeow Yeap

May 2011

Synthesis and characterization of cubic yttria-stabilized zirconia (8YSZ) nanoparticles by a modified sol-gel route using sucrose and pectin as organic precursors

Yttria-stabilized zirconia (YSZ) nanoparticles were synthesized through a sol-gel method using sucrose and pectin as organic precursors. These precursors are abundant in nature and cost effective. Different molar ratio of organic to inorganic (S:Zr4+) precursors were used. To determine the formed phase, x-ray diffraction (XRD) and Raman spectroscopy were performed. XRD pattern showed cubic phase for all...

Author(s): M. M. Kashani-Motlagh, A. Maghsoudipour, L. Majidzadeh Gorjani and F. Hashemzadeh

May 2011

Spectroscopic, thermal, magnetic and electrochemical studies of Tetrakis-μ-p-fluorobenzoatodicopper (II)

Tetrakis-μ-p-fluorobenzoatodicopper (II) was synthesized and spectroscopically characterized to have a binuclear, paddle-wheel structure with axially ligated ethanol molecules but with unexpectedly high magnetic moment value of 1.91 B.M. The complex was found to be thermally stable up to 280°C, and underwent three stages of decomposition process. The differential scanning calorimetric (DSC) curve showed three...

Author(s): M. I. Mohamadin, and N. Abdullah

May 2011

An investigation on a mild hydrothermal route to CuS nano and submicro structures

In this contribution, CuS nanostructures of various morphologies have been synthesized by manipulating time and choosing different copper sources via a mild hydrothermal method. The products were characterized by XRD, SEM, EDX and TEM analysis methods. Studies showed that after a definite time depending on the chosen copper source, the obtained pure CuS nanocrystals show a tendency towards self assembly and creating...

Author(s): K. Zare, M. Darouie, F. Mollaamin and M. Monajjemi

May 2011

A numerical study of steady state exothermic reaction in a slab with convective boundary conditions

In this paper, we considered a steady state, exothermic nth order oxidation chemical reaction in a slab with reactant consumption in the presence of convective heat and oxygen exchange with the surrounding ambient at the slab surface. The coupled nonlinear differential equations governing the system are obtained and are solved numerically using the standard Newton–Raphson shooting method along with a...

Author(s): A. M. K.  Legodi and O. D. Makinde

May 2011

Resolving a complex seismic moment tensor into a series of simple double couple sources: A case of Turkey

The main goal of studying double couple sources in seismology is to obtain a complete description of the physics of the source. In other words, it is to describe the force system equivalent to physical mechanism in earthquake focus. Seismic moment tensor is a mathematical quantity defining the earthquake source. It characterizes all the information about the source. With this purpose, it describes the equivalent forces...

Author(s): Mehmet Utku

May 2011

A new parameters joint optimization method of chaotic time series prediction

To improve the prediction performance of chaotic time series, a new method is proposed for parameters joint optimization of phase space reconstruction and support vector machine (SVM). The main idea of the joint optimization method is that the parameters from phase space reconstruction and SVM are designed jointly using uniform design firstly, and then the parameters are optimized jointly based on self-calling SVM. The...

Author(s): Changsheng Xiang, Wei Zhou, Zheming Yuan, Yuan Chen and Xingyao Xiong

May 2011

Solvation force in a hard-sphere Yukawa fluid confined between walls

We apply a general density functional theory for calculating solvation force between two walls immersed in a fluid of particles. Solvation force is obtained for the hard-sphere Yukawa fluid confined between hard and attractive walls. To determine the density profile, we use the density functional theory proposed by Yi and Kim. This theory is based on the density functional approximation, which in turn is based on both...

Author(s): M. Kavosh Tehrani and M. R. Jalali

May 2011

Hot symmetric nuclear and neutron matter properties in the Thomas-Fermi model

Equation of state of hot nuclear and neutron matter are calculated in the frame of the Thomas-Fermi approximation using of the effective nucleon - nucleon interaction of Myers and Swiatecki in the new approach. The effect of temperature on effective mass, pressure, entropy and binding energy is discussed. A critical temperature of 17.4 MeV for symmetric nuclear matter is found and there is no phase transition in the...

Author(s): S. Mohammadpour Lima and S. Shamshirband

May 2011

Potential land use planning and agricultural land suitability classification of Bala Agricultural Farm, Ankara-Turkey

This study was aimed to determine the potential land use planning and classification of agricultural land suitability of Bala agricultural farm land located in Ankara province. According to the results of the detailed soil survey and mapping prepared previously, 23 different soil series and 125 land mapping units were determined in the study area. Land evaluation was carried out by using SENOL Land Evaluation System and...

Author(s): Füsun Sarisamur and Åžeref Kiliç